Commutator



May 19, 1942. w. A. HUMPHREY commu'rwon Filed Aug. 21, 1937 'WanrenA.Hum me y ATTORNEY Patented May lg 1942 stare- PATENT 1 Claim.

This invention relates to a new and improved commutator for electric motors.

An object of the invention is to provide a commutator having commutator segments provided with a longitudinally extending portion for connection with an armature winding. Another object is to provide a commutator having its individual commutator segments molded in an elec-- tric insulating huh. Other objects and advantages of the invention will be apparent from the specification and drawing, wherein:

Fig. 1 is a sectional perspective View of the molded commutator;

Fig. 2 is a perspective view of the commutator bar; and

Fig. 3 is a fragmentary view showing a method of securing the commutator segments to an armature winding.

The commutator comprises a hub l molded of suitable electric insulating material, such as a phenol-formaldehyde thermo-setting compound, for example Bakelite. As shown, the hub I6 is provided with a central bore H, and an integral-p ly molded key Hz for insertion in a cooperating slot in an armature shaft 25 to prevent relative rotation therebetween. Imhedded in the hub W, by the molding operation, is a plurality of spaced commutator segments or bars I3 having their motor brush contacting portions l4 projecting radially beyond the periphery l5 of the hub iii to provide undercuts it between the adjacent commutator bars.

ture winding.

A metal commutator bar is shown in detail in Figure 2 and is tapered inwardly toward its inner edge and comprises the motor brush engaging portion M having opposite ends 23 and 24 projecting beyond a reduced section l8 from which extends projections 59 and 2d, the latter projection extending beyond the end 24 of the tacting surface area of the commutator bars I3 is notreduced by slots normally provided in the brush contacting area for connection to the armature winding.

I claim:

In a commutator, a hub of electric insulatin material, a plurality of commutator segments having anchor means embedded in said hub, said segments having brush engaging surfaces spaced along the periphery of said hub and extending outwardly therefrom, and each of said anchor 1 means having a portion extending from one axial end of said huh and inwardly ofthe periphery of said brush engaging surfaces and of the periphery of saidhub for connection to an arma- WARREN A. HUMPHREY. 

